Wireless Sensor Networks

[edsel456]

I'm using a ratiometric sensor with an NI WSN-3202 node, and I'd like to be able to know exactly what voltage the node is providing as excitation so that I can properly determine the sensor reading.  Is there any way to read out this value?  I know it's supposed to be 11.5-12.5 volts, but that's an awfully big range and I'd like to know what it actually is.

Thanks

[PackersFan]

Are you using all of your analog channels?

Why not use one of them to measure the excitation voltage?

[edsel456]

I was, but I sacrificed one to read the voltage.

[PackersFan]

If you measure the voltage once, it should remain pretty steady.  However, it can drift with operating temperature and the like.  I believe the wide spec is due to the tolerance of the hardware and you won't really see that full range with your specific node.